A balloon made up of a fabric weighing 80 N has a volume of 1.0 × 10⁷ cm. the balloon is filled with hydrogen of...

A balloon made up of a fabric weighing 80 N has a volume of 1.0 × 10⁷ cm. the balloon is filled with hydrogen of density 0.9 kgm^-3. Calculate the greatest weight in addition to that of the hydrogen and the fabric, which the balloon can carry in air of average density 1.25 kgm^-3

Answers

Upthrust = weight of the air displaced
= volume of air × density × gravity
= (1.0 × 10⁷ × 10⁶) × (1.25 × 10)
= 10 × 1.25 × 10 = 125 N
Weight of hydrogen = 10 × 0.09 × 10 = 9 N
Total weight of hydrogen and fabric = 80 + 9 = 89 N
Total additional weight to be lifted = 125 – 89 = 36 N.

---

Mutiso answered the question on October 16, 2018 at 07:17

Next: A solid of mass 1.0 kg is suspended using a thread and then submerged in water. If the tension on the thread is 5.0 N,...
Previous: You and your group members have been assigned the topic: ‘Responsibilities of a Good Citizen’ by your teacher of History and Government. You are supposed...

View More Physics Questions and Answers | Return to Questions Index

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

• A solid of mass 1.0 kg is suspended using a thread and then submerged in water. If the tension on the thread is 5.0 N,...(Solved)
  

  A solid of mass 1.0 kg is suspended using a thread and then submerged in water. If the tension on the thread is 5.0 N, determine the relative density of the solid.

  Date posted: October 16, 2018.  Answers (1)

• Applications of Archimedes principle and relative density(Solved)
  

  Applications of Archimedes principle and relative density

  Date posted: October 16, 2018.  Answers (1)

• Describe experiment to determine the relative density of a cork(Solved)
  

  Describe experiment to determine the relative density of a cork

  Date posted: October 16, 2018.  Answers (1)

• A wooden block of dimensions 3 cm × 3 cm × 4 cm floats vertically in methylated spirit with 4 cm of its length in...(Solved)
  

  A wooden block of dimensions 3 cm × 3 cm × 4 cm floats vertically in methylated spirit with 4 cm of its length in the spirit. Calculate the weight of the block. (Density of methylated spirit = 8.0 × 10² kgm^-3)

  Date posted: October 16, 2018.  Answers (1)

• Describe experiment to demonstrate the law of flotation (Solved)
  

  Describe experiment to demonstrate the law of flotation

  Date posted: October 16, 2018.  Answers (1)

• A block of metal of volume 60 cm³ weighs 4.80 N in air. Determine its weight when fully submerged in a liquid of density 1,200...(Solved)
  

  A block of metal of volume 60 cm³ weighs 4.80 N in air. Determine its weight when fully submerged in a liquid of density 1,200 kgm^-3.

  Date posted: October 16, 2018.  Answers (1)

• Describe an experiment to demonstrate Archimedes principle(Solved)
  

  Describe an experiment to demonstrate Archimedes principle

  Date posted: October 16, 2018.  Answers (1)

• Describe the applications of centripetal force(Solved)
  

  Describe the applications of centripetal force.

  Date posted: October 16, 2018.  Answers (1)

• Derive an expression for centripetal acceleration(Solved)
  

  Derive an expression for centripetal acceleration.

  Date posted: October 16, 2018.  Answers (1)

• Define the term centripetal force(Solved)
  

  Define the term centripetal force.

  Date posted: October 16, 2018.  Answers (1)

• A wheel of radius 50 cm is rolled through a quarter turn. Calculate (i) The angle rotated in radians (ii) The distance moved...(Solved)
  

  A wheel of radius 50 cm is rolled through a quarter turn. Calculate (i) The angle rotated in radians (ii) The distance moved by a point on the circumference.

  Date posted: October 16, 2018.  Answers (1)

• Define radian(Solved)
  

  Define radian.

  Date posted: October 16, 2018.  Answers (1)

• What is angular motion?(Solved)
  

  What is angular motion?

  Date posted: October 16, 2018.  Answers (1)

• What is circular motion?(Solved)
  

  What is circular motion?

  Date posted: October 16, 2018.  Answers (1)

• Find the power of a concave lens of a focal length 25 cm.(Solved)
  

  Find the power of a concave lens of a focal length 25 cm.

  Date posted: October 15, 2018.  Answers (1)

• Explain the common eye defects and their corrections(Solved)
  

  Explain the common eye defects and their corrections.

  Date posted: October 15, 2018.  Answers (1)

• Explain the uses of lenses on optical devices(Solved)
  

  Explain the uses of lenses on optical devices

  Date posted: October 15, 2018.  Answers (1)

• Experiment to determine the focal length of a converging lens using the lens formula(Solved)
  

  Experiment to determine the focal length of a converging lens using the lens formula

  Date posted: October 15, 2018.  Answers (1)

• The lens of a slide projector focuses on an image of height 1.5m on a screen placed 9.0 m from the projector. If the height...(Solved)
  

  The lens of a slide projector focuses on an image of height 1.5m on a screen placed 9.0 m from the projector. If the height of the picture on the slide was 6.5 cm, determine, (a) Distance from the slide (picture) to the lens (b) Focal length of the lens

  Date posted: October 15, 2018.  Answers (1)

• The focal length of a converging lens is found to be 10 cm. How far should the lens be placed from an illuminated object to...(Solved)
  

  The focal length of a converging lens is found to be 10 cm. How far should the lens be placed from an illuminated object to obtain an image which is magnified five times on the screen?

  Date posted: October 15, 2018.  Answers (1)